Little "exploit" I found for free wins:

Play something obviously counter heavy in Historic Brawl.

After being tired of losing to Golos all the time, I switched to Mono counters Baral.
Since the share of Golos has only increased, this was very good.
It appears, a lot of people who play Historic Brawl are: a) bad and b) only want to masturbate using their commander.
Most Golos players instantly concede before keeping a hand.
Generally, a lot of players concede after enough spells have been countered to run out their patience.
I had people concede who were ahead on the board while I was hellbent after using my last counter.
Almost every other deck I encountered was Winota and 5feri which are both winable.